A Way Forward With Drugs, Ctd

Mark Kleiman continues to argue against commercial cannabis. He still wants a "grow your own" policy:

The rate of problem use among cannabis users is lower than the
rate of problem drinking among drinkers (lifetime risk of about 10% v.
lifetime risk of at least 15%) but that's under conditions of
illegality and high price. The risks of chronic heavy cannabis use
aren't as dramatic as the risks of chronic heavy drinking - the stuff
doesn't kill neurons or rot your liver, and generates less crazy
behavior than beer - but that doesn't make those risks negligible. Ask
any parent whose fifteen-year-old has decided that cannabis is more fun
than geometry. Of the 10% of cannabis smokers who become heavy daily
smokers for a while, the median duration of the first spell of heavy
use (not counting the risks of relapse) is 44 months. That's not a
small chunk to take out a lifetime, especially a young lifetime.

Cannabis
isn't harmful enough to be worth banning. But that doesn't mean that
it's safe to give America's marketing geniuses a new vice to peddle.

Kleiman has been beating this drum for a long time. I don't have a problem with "grow your own" in theory but worry that prohibiting commercial cannabis will sustain the black-market. What are the other unintended consequences?

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